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Immunohistochemical staining (IHC). (A) IHC with cytokeratin 7—diffuse and strong cytoplasmic positivity in malignant epithelial cells of high- grade serous component of the tumour, ×200 magnification; (B) IHC with desmin which shows cytoplasmic positivity of sarcomatous component with smooth muscle differentiation, ×100 magnification; (C) IHC with p53 which shows that both components are negative, magnification ×200.
